Lock.



E. B. DAROOWA LLA,

LOCK.

APPLICATION FILED FEB. 25, 1916.

1 ,272,230. Patented July 9, 1918.

LOCK.

Specification of Letters Patent.

Patented July 9,1918.

Application filed February 25, 1916. Serial No. 80,431.

To all whom. it may concern:

Be it known that I, ERUCHSHAW DARoowALLA, a subject or" the Emperor of India, residing in Bombay, in India, have invented certain new and useful Improvements in Locks, of which the following is a specification.

This invention relates to looks and pro vides means which render the picking of looks more difiicult.

The invention comprises a key, bits on the same side of the stem of the key, two distinct lever locks, and a single main lock bolt, the lever locks being operated by the bits at different periods of revolution of the key and so combined that one looks the other.

In one form of the invention the lock bolts act at right angles to each other and the two tongues of the key come into action in positions 90 degrees apart. I

The lock case may be divided by a partition into divisions wherein the two sets of lock mechanism are located.

A construction according to the invention is shown on the annexed sheet of drawings, in which:

Figure 1 shows the lock with the cover removed, exposing the mechanism above the partition;

. Fig. 2 the mechanism behind the partition;

Figs. 3 and 4; two views of one of the bolts;

Fig. 5 is a section of the complete look as seenfrom the end where the other bolt projects;

Fig. 6 a plan of the last mentioned bolt;

. Fig. 7 a side view of Fig. 6;

Fig. 8 an end view of Fig. 6; and

Fig. 9 the key with the double tongue.

The casing is shown at a with its cover at b. (Fig. 5) and the partitionv at 0. The mechanism illustrated in Fig. 1 is acted upon by the upper bit 7" of the key. In the position shown in Figs. 1 and 2 the look is shown locked and assuming that it is a case of unlocking, the key 1" is inserted in the key hole m and the lever g, pivoted at h, is raised until it clears the locking pin o with the result that the end a of the bolt f (Figs. 3 and 4) can be moved out of the slot zf in the extension 6 of the other bolt 03, and rests between the posts p and n in unlocked position. The key being moved through 90 further in a clockwise direction the bit r then engages the lever g, pivoted at 5 raising it to clear the locking pin 70 on the bolt (1 (Fig.

BYRAMJL 2). The bolt (Z is then moved back and the operation of unlocking the lock is complete. The reverse movement shoots the two bolts in reverse order. The lever mechanism is similar in the two locks.

What I claim as my invention and desire to secure by Letters Patent is 1. In a lock mechanism, a key, two bits thereon, a lock casing, a single main lock in projected position, one of the said bits being adapted to operate the said lever lock to unlock the bolt and to effect the sliding movements of the latter, a second bolt adapted to engage with and lock the first bolt in projected position, a second lever loc'k dis tinct from the first and adapted to lock the said second bolt when the latter is in looking engagement with the first bolt, said second lever lock being adapted to be operated by the other bit of the key to cause the said second bolt to unlock the first bolt, both of the said lever locks being operatable by the pits at difi'erent periods of revolution of the rey.

2. In a lock mechanism, a key, two bits thereon, a lock casing, a single main lock bolt arranged in the casing and adapted to be projected at one end exteriorly of the same, a partition within the casing and dividing the interior of the latter into two compartments, a lover lock arranged in one compartment and adapted to lock the bolt in projected position, one of the said bits being adapted to operate the said lever lock to un lock the bolt and to efl'ect the sliding movements of the latter, a second bolt arranged within the other compartment and adapted to engage with and lock the first bolt in projected position, a second lever lock arranged in the same compartment with the said second bolt and adapted to lock the latter when it is in looking engagement with the main bolt, said second lever lock being adapted to be operated by the other bit of the key to cause the second bolt to unlock the main bolt, both of the said lever locks being operatable by the bits at dilferent periods of revolution of the key.

3. In a lock mechanism, a key, two bits thereon, a lock casing, a single main lock bolt arranged in the casing and adapted to be projected at one end exteriorly of the same, a second bolt in the casing and slidable at right angles to the main bolt andengageable therewith tov lock the latter in projected position, a lever lock adapted to engage with and lock the main bolt in project-- 5 ed position, a second lever lock adapted to out of engagement with the main bolt, and the other bitbeingadapted during-a further period of revolutionv of the key to operate the other lever lock to cause it to unlock the main bolt and to effect the sliding, movement of the latter as and for the purpose sped-- 4. In a lock mechanism, a key, two bitsthereon, a lock casing, 'a single main lock bolt in the casing and adapted to be proj ected at one end exteriorly of the same, said bolt being provided with a slot, a second bolt in the casing and slidable at right anloek the main bolt in projected position, one

of the bits of the key being adapted during one period of revolution of the key toswing the first-1nentioned lever lock tofree the said second bolt and to slide the latter out of the slot in the main bolt, and the other bit being adapted during a further period of revolution of the key to swing the second lever lock to free the main bolt and to effect the sliding movement of the latter.

5. In a lock mechanism, a key, two bits thereon, a lock casing, a partition dividing the interior of the easing into two compartments, a main lock bolt in one compartment of the casing adapted to be projected at one end eXteriorly oi" the same and having anextension projecting into the other compartinent, said extension being provided with a 0 slot, a second bolt arranged in the compartinent into which the extensionprojects, and engageable within the slot of said extension to lock the main bolt in projected position, a lever look also arrangedin the last-mentioned compartment and engageablewith the said second bolt to lock it when engaged in the slot, a second lever lock arranged in the other compartment of the casing and engageable with themain bolt to lock it when I '(Iepies of this patent may be obtained for the key to operate one of the lever locks to free the second bolt and to slide the latter gles to: the main bolt and engageable at one end in the slot of'the main belt tolock, thein projected position, one of the bits of the key being adapted during one period of revolution of the key to operate one of the lever locks to free the said second bolt and to slide the latter out of engagement with the slot inthe main bolt extension, and the-other bit being adapted during a further period of revolutionofthe key to operate the other lever lock to cause it to unlock the main bolt and to effect the slidingmovement-of the'la-tter as and for the purpose-specified.

6. In a lock mechanism, a key, tWo bits thereon, a lock casing, a single main lock bolt arranged in the casing and adapted to be projected at one end exteriorly of the same, a pivoted lever lock adaptedto lockthe bolt in projected position, one of the said bits being adapted to operate the said'lever lock to unlock the bolt and toeffeot the sliding movements of the latter, a second bolt adapted to engage with and lock the first bolt in projected position, a second pivoted lever lock distinct from the first and adapted to lock the said second bolt whenthe latter is in locking engagement with the first bolt, said second lever lockbeing adapted to be operated by the other bit ofthe key to cause the said second bolt to unlock the first bolt, both of the said lever locks being o'peratable by the bits at diflerent periods of revolution of the key.

7. In a lock mechanism, a key, two bits thereon, a lock casing, a slidable main lock bolt in the casingand' adapted tobe projected at one end eXteriorly of the same and being provided with a locking pin, a second bolt in the casing slidable at rig-ht angles to the main bolt and providedwith a locking pin, said second bolt being adapted to engage with and lock the main bolt in pro-- jected position, a lever lock provided with a lug adapted to engage with the locking pin on the second bolt tolock the latter in looking engagement with the main bolt, a second lever lock provided with a lug adapted to engage with the-locking pin on the main. bolt to lock the latterin projected position, the said lever locks being operatable by the bits of the key during di-fierent periods of revolution of the latter for the purposes set forth. 7

In testimony whereof have'signed'iny name to this specification in the presence 0t two subscribing witnesses.

ERUCHSHAW BYR'AMJI DAaROOWALLA.

Witnesses:

J. M. RUTNAGUR, HILDA 'V'. LYNCH. 

